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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards related to excess share-based compensation	$ 1.9ino_OperatingLossCarryforwardsAmountRelatedtoExcessSharebasedCompensation
Tax benefits expired	27.1ino_TaxBenefitsExpired
Unrecognized tax benefits that would impact effective tax rate	2.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	159.3ino_OperatingLossCarryforwardsExpirationinPeriodStatuteLimitationsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	159.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	159.4us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
California
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	60.1ino_OperatingLossCarryforwardsExpirationinPeriodStatuteLimitationsNet / us-gaap_IncomeTaxAuthorityAxis = ino_CaliforniaIncomeTaxAuthorityMember
Pennsylvania
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	99.3ino_OperatingLossCarryforwardsExpirationinPeriodStatuteLimitationsNet / us-gaap_IncomeTaxAuthorityAxis = ino_PennsylvaniaStateIncomeTaxAuthorityMember
Research Tax Credit Carryforward | Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount	2.8us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember
Research Tax Credit Carryforward | State
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount	$ 2.1us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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